<!DOCTYPE html>
<html lang="zh-CN">
	<head>
		<meta charset="utf-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width,initial-scale=1.0" />
		<title>Echarts Example</title>
	</head>
	<body>
		<div id="main" style="width: 600px;height: 400px"></div>

		<script src="//cdn.bootcss.com/echarts/4.5.0/echarts.js"></script>
		<script type="text/javascript">
			var myChart = echarts.init(document.getElementById('main'));

			var data = [];
			var max = 300;
			for (var i = 0; i <= max; i++) {
				var angle = Math.ceil(i * ((360 * 6) / max));
				// 根据阿基米德螺旋公式：
				// r = a + b * θ
				var r = angle;
				data.push([r, angle]);
			}

			var option = {
				toolbox: {
					feature: {
						saveAsImage: {},
					},
				},
				polar: {},
				angleAxis: {
					type: 'value',
					startAngle: 0,
					min: 0,
					max: 360,
				},
				radiusAxis: {},
				series: [{ showSymbol: false, coordinateSystem: 'polar', type: 'line', data: data }],
			};
			myChart.setOption(option);
		</script>
	</body>
</html>
